Beamline description

The HPCAT 16-BM-B beamline is dedicated to white beam x-ray diffraction and radiography research of materials under high pressure.

With the APS bending magnet white x-rays (5-120 keV), multi-angle energy dispersive x-ray diffraction (EDXD) technique is extensively utilized to obtain the structure factors up to Q=around 20 Å-1. A Paris-Edinburgh Cell (PEC) (250 ton capability) is equipped for samples requiring a large scattering volume, especially, for the high-temperature melt and amorphous structure. The range of pressure and temperature is up to 7 GPa and 2300K. The PEC setup includes white beam radiography system, which allows the structure measurement with EDXD to be combined with radiographic volumetry, ultrasonic sound velocity measurement and/or falling sphere viscosity measurement.

Summary of 16-BM-B features

16-BM-B features

Feature

Description

Source

bending magnet

Monochromator

N/A, white beam

Energy range

10-120 keV for parallel beam; 10-65 keV for focused beam

Beam size & focusing optics

50 μm x 50 μm to 2 mm x 2 mm for parallel beam (slit-limited) 10 micron (H) x 10 micron (V) FWHM with 200 mm Pt-coated Si KB- type mirror

Established techniques

Multi-Angle Energy Dispersive X-ray Diffraction, White Beam Radiography, Ultrasonic elastic wave velocity measurement, Falling sphere liquid viscosity measurement

Detectors

Ge Solid State Detector, CCD camera (Prosilica GC1380H), High-speed camera (Photron FASTCAM SA3)

Support equipment

Paris-Edinburgh type large volume press with resistive heating capacity (PE anvils, boron-epoxy gaskets, cylindrical graphite heater, 8V-220A power supplier; temperature and pressure range up to 2500 K under and 7 GPa)